What is this

[Longranger81]

What is causing this the round is sticking in chamber

 

[drop_point]

Looks to me there are marks from the rifling on the lower portion of the bullet Perhaps it is seated too long? Or could be the chamber is dirty or wasn't properly cut. Have you tried a shorter COAL?

 

[Clancy]

It looks like a cartridge fed from a box magazine into a dirty chamber to me. Neither of those are a problem if the gun is shooting well.

 

[Longranger81]

It’s a brand new barrel shilen select match. I can load to min COAL and it sticks bad witch is 3.685 I can load it down to 3.5 and stop it from sticking. Round was not fed from a mag single fed straight into chamber

 

[CJ6]

It’s a brand new barrel shilen select match. I can load to min COAL and it sticks bad witch is 3.685 I can load it down to 3.5 and stop it from sticking. Round was not fed from a mag single fed straight into chamber

You answered your own question...... The chamber/throat is not setup for this bullet.

 

[jsn]

Wrong or non-existent freebore for what you are trying to load in it?

 

[Longranger81]

That’s my thoughts too but just couldn’t figure out why it would be that much less than saami spec I’ve never had a rifle that I couldn’t load longer than the books say

 

[Dusty Stevens]

That rub mark looks like its from an ejector pushing it to one side. Hard to see just how much youre jammed. Shooting bullets jammed is alot better if you dont unload it- only chamber what youll be firing

 

[Longranger81]

I don’t have a ejector so that definitely can’t be it

 

[CJ6]

That’s my thoughts too but just couldn’t figure out why it would be that much less than saami spec I’ve never had a rifle that I couldn’t load longer than the books say

It's the bullet that's messing you up. The CBTO length is too long.

 

[Longranger81]

That’s what I thought but when I called the barrel company they said if that was the case it would hit at the front side of the ogive not the back side

 

[gambleone]

That’s what I thought but when I called the barrel company they said if that was the case it would hit at the front side of the ogive not the back side

Looks like it is hitting from the front side and pushing the black marker back.

 

[Bill K]

Is it only hitting that one spot ? That is what it appears to be doing, from the photo. If so, I would say the lead area is off kilter or has a high spot. Can you make a chamber cast and do some measuring ?

 

[Longranger81]

Is it only hitting that one spot ? That is what it appears to be doing, from the photo. If so, I would say the lead area is off kilter or has a high spot. Can you make a chamber cast and do some measuring ?

Yes only hits that one spot and idk how to cast a chamber

 

[RegionRat]

Suggest you research the blueprint values of the following:
1. The Cartridge Specification.
2. The Chamber Specification.
3. And research what your Shilen Select is supposed to be compared to the industry specs.

The details in item 3 will also include their specific neck diameter, and throat details that affect bullet seating.

Then, also suggest you determine the most critical values for the following:

1. Shoulder Datum length, and compared to your brass. The difference affects how much the base of the case will go forward on virgin or sized brass. (This is typically small for most cartridge designs but for example on a 303 Brit, it can blow forward 0.035" - 0.045" or more and needs too be tracked.)
2. CBTO, distance to touch lands for the given bullet.
3. Shoulder to body junction diameter, virgin, fired, post size.
4. 200 line diameter, virgin, fired, post sized.

With those understood, you will be able to determine the vast majority of causes and issues with chambering rounds.

 

[Newhouse]

I would suspect that’s a freebore issue as it was on mine.
This thread had a good ending after going back to shilen. https://forum.accurateshooter.com/t...-possible-throat-issue.4062278/#post-38323559

 

[Rocketvapor]

I does look like it's hitting the front of the ojive in the second picture.
Even some rub marks in the black around the bullet.

 

[Bill K]

If you have a shooting buddy that knows or a local gunsmith, have them do one for you. It can tell you a lot of issues that could be causing this.

Yes only hits that one spot and idk how to cast a chamber

 

[Rocketvapor]

The 'land' marks continue down the bullet to what looks like a ridiculously short freebore.
Load a bullet backwards and use your borescope to measure/examine the freebore.
Your concentrically is good, right?
Turn the cartridge 180 degrees and see if it marks a new spot or follows the cartridge.

 

[338 dude]

What is causing this the round is sticking in chamber

Carbon ring